FIT FIRST teen - a cluster RCT evaluating the effects of a 10-week high-intensity exercise intervention for
Christina Birch Meiner1, Caroline Eckert1, Charlotte Sandager Aggestrup1,2
1Department of Sports Science and Clinical Biomechanics, Sport and Health Sciences Cluster (SHSC), Faculty of Health Sciences, University of Southern Denmark, Odense, Denmark.
Objectives:
To evaluate the effects of a 10-week thrice-weekly FIT FIRST Teen (FFT) intervention on cardiorespiratory fitness in Danish 12-15-years-olds.
Design:
A cluster-randomised controlled study.
Participants:
One thousand four hundred and seventeen Danish pupils (51.1% female) from 15 municipal schools, allocated to an intervention group (FFT: n = 994, 13.5 (0.6) years (mean (SD)), 165.8 (8.7) cm, 57.8 (13.4) kg) or a usual practice control group (CON: n = 423, 13.8 (0.8) years, 167.7 (11.5) cm, 58.6 (12.2) kg).
Methods:
The FFT group completed three weekly 40-min FFT sessions with modified, motivating, involving, high-intensity sports-based activities. Before and after the 10-wk intervention period resting heart rate and blood pressure, body composition, postural balance, standing long jump and performance on the Yo-Yo intermittent recovery level 1 children's test (YYIR1C) were measured. Group effects for all outcome variables were tested using multi-level linear mixed models.
Results:
The group effect analyses showed no significant differences between FFT and CON in the YYIR1C test (p = 0.080). A significant small difference between groups was found in resting heart rate (d = 0.29, p = 0.039) in favour of FFT. No significant between-group differences were observed in body composition, or the remaining cardiovascular or physical fitness variables (p >0.05).
Conclusion:
The lack of significant effects for the majority of the outcome measures calls for further development and long-term testing of the programme.
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